[aL_bmwf30]

Hello guys, looking for your help and advice.

I have a bmw f30 N26 72K miles. The last 2 years my car shakes in the morning when I start it up when its below 50 degrees, after 10 mins of running shaking goes away but still doesn't run as smooth as it used to. I have changed spark plugs and scanned the computer no check engine light and no codes come up. What could it be? Any ideas?

[cfm56d7b]

Originally Posted by aL_bmwf30

Hello guys, looking for your help and advice.

I have a bmw f30 N26 72K miles. The last 2 years my car shakes in the morning when I start it up when its below 50 degrees, after 10 mins of running shaking goes away but still doesn't run as smooth as it used to. I have changed spark plugs and scanned the computer no check engine light and no codes come up. What could it be? Any ideas?

What code scanner did you use? How pronounced are the rough idle / shaking symptoms?

10 minutes is a long time for a code not to be produced. While remote diagnostics are very difficult at best, all components which participate in creating the right fuel mixture would be the first area to examine.

[aL_bmwf30]

Originally Posted by cfm56d7b

What code scanner did you use? How pronounced are the rough idle / shaking symptoms?

10 minutes is a long time for a code not to be produced. While remote diagnostics are very difficult at best, all components which participate in creating the right fuel mixture would be the first area to examine.

I used Ancel BM700 scanner. The shaking of the engine is pretty loud like shivering shakes the most the first 3-5 mins when cold, when I shift in Neutral the shaking goes away. In drive and reverse it shakes until 10 mins when car is warmed up shaking goes away in Drive and Reverse

[BimR]

So do I Sorry, couldn't resist.

If you can't find codes, it might be fuel pump/pipe related?

[Striple]

Sounds like a fuel issue, but 2 years of it isn’t just bad gas. Could be something with the injectors themselves too?

[ATL_Nak-Muay]

Originally Posted by BimR

So do I Sorry, couldn't resist.

If you can't find codes, it might be fuel pump/pipe related?

Beat me to it.

[ewizzle]

Could it be engine mounts have failed/need replacement?

[aL_bmwf30]

Originally Posted by ewizzle

Could it be engine mounts have failed/need replacement?

Thanks for the reply guys. What you mean by fuel problem what could it be?

I was thinking also could it be engine mounts? Because I do have drivetrain vibration sometimes when I drive the car, the power is not as smooth as it used to be?

[aL_bmwf30]

Any idea would could it be still having the issue?

[pshovest]

Run the scan while engine is running poorly. Do not wait until you shut the engine off.
Leaking fuel injectors can put fuel in cylinder after engine is off, causing rough running on the next start. Anything unusual about the color of the plugs you changed?

[keepfeeling]

the injector may be the reason, i guess

[aL_bmwf30]

Originally Posted by keepfeeling

the injector may be the reason, i guess

How would I confirm if it's the injectors?